Adhesive paper and the manufacture of same



Patented June 24, 1930 UNITED STATES PATENT, OFFICE JOHN MUIR, OF LONDON, ENGLAND, ASSIGNOR- ONE-HALF TO GEORGE HENRY WILKINSON, OF LONDON, ENGLAND ADHESIVE PAPER AND THE MANUFACTURE SAME No Drawing. Application filed June 15, 1928, Serial No. 285,786, and in Great Britain March 2, 1928.

This invention relates to a paper and-to the manufacture of same and has more particularly to do with the treatment of paper after it is made into sheets, whether in roll or other form, for the purpose of rendering it adhesive on one side when moisture is applied, without the application to; that side of the usual gum.

It is well known amongst users of adhesive paper as hitherto supplied that a number of disadvantages are occasioned by the application of the gum, amongst which is the fact that the sheet becomes curved, will not lie fiat and a number of sheets, whether of large or small size, such as labels, whenstacked together quickly adhere to each other, particularly if in a damp atmosphere.

These disadvantages have resulted in the necessity of placing separating sheets between each of the gum sheets or of using the gum. sheets very quickly after they are v made and before they have had time to adof glue,

here to each other.

According to my invention these disadvantages are entirely" overcome and I produce at a low cost a paper which will when moistened on one side become thoroughly adhesiveon that side and suitable for all purposes to which adhesive paper-has previously been applied, and with the advantages, amongst others, that. the paper made by me is not liable to curve and because it will lie perfectly flat it is more easily handled for printing and analogous purposes, in addition to which there is no waste owing to the sheets having to be thrown away when they are stuck to each other.' 4

My invention is applicable to practically all kinds of paper and may be broadly described as consisting in a method of treating one side of sheetpaper so that when it is moistened it becomes adhesive, said treatment comprisingthe application by brushing, spraying or feltingof a mixture water and mineral matter in variable proportions according tothe nature 'of the paper, then drying the paper in known or convenient manner.-

sist of from ten to forty parts of glue, fifty for example, conto seventy parts of water, and twenty to fifty parts of mineral matter, all these parts being by weight and the mineral matter consisting of say clay, white, or plumbago. Any or all of these are intimately mixed and then applied evenly to the surface to be treated, said surface being dried either in festoons, by running over heated cylinders, or through hot air chambers.

The quantities used are governed by the substance treated, inasmuch as a thin grade of stock utilizes a minimum quantity of glue as against a heavy substance which uses a larger quantity, the parts of mineral matter being proportionally reduced.

The mineral matters specified are, selected in accordance with the fibre grade of the quality of paper possessing corresponding minerals.

It is to be understood that the adhesive may be and preferably is tinted, while the paper is not.

What I claim is: r

The method of treating paper to render one surface thereof adhesive While preventing the paper from curling when the adhesive is dry and preventing the adhesive from becoming effective in damp atmosphere consisting in applying to one side of the paper an intimate mixture of glue, water and mineral matter, and drying the adhesive.

In testimony whereof I aflix my signature.

.JOHN MUIR.

chalk, terra alba, French 

